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CHAPTER 12 WATCHDOG TIMER
Prescaler
fXX
2
4
fXX
2
5
fXX
2
6
fXX
2
7
fXX
2
8
fXX
2
9
Selector
Watchdog Timer
Mode Register
Internal Bus
Internal Bus
TCL22 TCL21 TCL20
fXX/2
3
fXX
2
11
Timer Clock
Select Register 2
3
WDTM4RUN WDTM3
8-Bit
Counter
TMMK4
RUN
TMIF4
INTWDT
Maskable Interrupt
Request
RESET
INTWDT
Non-Maskable
Interrupt Request
Control
Circuit
12.2 Watchdog Timer Configuration
The watchdog timer consists of the following hardware.
Table 12-3. Watchdog Timer Configuration
Item Configuration
Timer clock select register 2 (TCL2)
Watchdog timer mode register (WDTM)
Figure 12-1. Watchdog Timer Block Diagram
Control register